EM4: Automotive EMC Technology at Karlsruher Institut Für Technologie | Flashcards & Summaries

# Lernmaterialien für EM4: Automotive EMC Technology an der Karlsruher Institut für Technologie

Greife auf kostenlose Karteikarten, Zusammenfassungen, Übungsaufgaben und Altklausuren für deinen EM4: Automotive EMC Technology Kurs an der Karlsruher Institut für Technologie zu.

TESTE DEIN WISSEN

What are the two types of immunity

Lösung anzeigen
TESTE DEIN WISSEN
• Electromagnetic fields
• Electrostatic discharge
Lösung ausblenden
TESTE DEIN WISSEN

Name some strategies to eliminate electromagnetic influences

Lösung anzeigen
TESTE DEIN WISSEN

- Minimize source amplitude

- Disconnect coupling path

- Maximize fault tolerance

Lösung ausblenden
TESTE DEIN WISSEN

Name some technologies to evaluate emission signals

Lösung anzeigen
TESTE DEIN WISSEN

Peak detector

- Capacitor is being charged to the max value of the envelope curve + correction by a factor

Average detector

- Capacitor is charged to current value

- Low pass filter smoothes voltage (--> average value)

Lösung ausblenden
TESTE DEIN WISSEN

Whats the influence of the so called Curie temperature on inductors?

Lösung anzeigen
TESTE DEIN WISSEN

Permeability suddenly decreases at temperatures between 100 - 350°C

Lösung ausblenden
TESTE DEIN WISSEN

What are the two types of emissions

Lösung anzeigen
TESTE DEIN WISSEN
• Internal emission affecting other components in the vehicle - quality issue regulated by OEM
• External emissions affecting the environment - regulated by law
Lösung ausblenden
TESTE DEIN WISSEN

Explain the effects of the Maxwell equations

Lösung anzeigen
TESTE DEIN WISSEN
• High frequency
• Change in magnetic field induces an electrical field
• Change in electrical field induces a magnetic field
• Low frequency (geometry > 6 lambda)
• No interaction between M and E field
• E field dependent on voltage
• M field dependent on current
Lösung ausblenden
TESTE DEIN WISSEN

Explain the Fourier transform and different bandwidths

Lösung anzeigen
TESTE DEIN WISSEN
• Fourier transform is from time to frequency range
• Periodic signals are sum of distinct frequencies ➔ Narrowband
• Pulses and irregular signals are sum of all frequencies in a range ➔ Wideband
• The shorter a rise time the higher the frequencies occurring in the signal.
Lösung ausblenden
TESTE DEIN WISSEN

What is the working principle of a test receiver

Lösung anzeigen
TESTE DEIN WISSEN

Sweep through all frequencies and always only measure a small frequency range using a band-pass filter. Changing of filter is not possible ➔ Multiply input with generated frequency to transform signal and calculate back to original value after measurement.

Lösung ausblenden
TESTE DEIN WISSEN

When is a signal classified as broadband?

Lösung anzeigen
TESTE DEIN WISSEN

>6 dB difference between Average and Peak value

Lösung ausblenden
TESTE DEIN WISSEN

Explain the definition of EMC

Lösung anzeigen
TESTE DEIN WISSEN

Electromagnetic Compatibility

„The ability of an equipment or system tofunction satisfactorily in its electromagnetic environment without introducing intolerable electromagnetic disturbances to anything in that environment“

Emission (legislation) - Immunity (OEM specification)

Lösung ausblenden
TESTE DEIN WISSEN

What is the complexity of EMC in a vehicle environment?

Lösung anzeigen
TESTE DEIN WISSEN
• Immunity
• Root cause analysis difficult due to networked system
• Emission
• Device under test must be isolated ➔ Rest bus simulation required
• Optical link between DUT and measurement devices to prevent influences
• New Operating modes in electric or hybrid vehicles that are hard to reproduce (boosting, recuperating, ...)
Lösung ausblenden
TESTE DEIN WISSEN

How can one shield against electromagnetic coupling effects?

Lösung anzeigen
TESTE DEIN WISSEN

- Cable shielding with mesh wire, metal slide or metal tube (Copper or aluminium)

- Shielding of the housing (Metal)
- Material: Laminations or slides of galvanized steel, aluminium or copper

Lösung ausblenden
• 75932 Karteikarten
• 1876 Studierende
• 192 Lernmaterialien

## Beispielhafte Karteikarten für deinen EM4: Automotive EMC Technology Kurs an der Karlsruher Institut für Technologie - von Kommilitonen auf StudySmarter erstellt!

Q:

What are the two types of immunity

A:
• Electromagnetic fields
• Electrostatic discharge
Q:

Name some strategies to eliminate electromagnetic influences

A:

- Minimize source amplitude

- Disconnect coupling path

- Maximize fault tolerance

Q:

Name some technologies to evaluate emission signals

A:

Peak detector

- Capacitor is being charged to the max value of the envelope curve + correction by a factor

Average detector

- Capacitor is charged to current value

- Low pass filter smoothes voltage (--> average value)

Q:

Whats the influence of the so called Curie temperature on inductors?

A:

Permeability suddenly decreases at temperatures between 100 - 350°C

Q:

What are the two types of emissions

A:
• Internal emission affecting other components in the vehicle - quality issue regulated by OEM
• External emissions affecting the environment - regulated by law
Q:

Explain the effects of the Maxwell equations

A:
• High frequency
• Change in magnetic field induces an electrical field
• Change in electrical field induces a magnetic field
• Low frequency (geometry > 6 lambda)
• No interaction between M and E field
• E field dependent on voltage
• M field dependent on current
Q:

Explain the Fourier transform and different bandwidths

A:
• Fourier transform is from time to frequency range
• Periodic signals are sum of distinct frequencies ➔ Narrowband
• Pulses and irregular signals are sum of all frequencies in a range ➔ Wideband
• The shorter a rise time the higher the frequencies occurring in the signal.
Q:

What is the working principle of a test receiver

A:

Sweep through all frequencies and always only measure a small frequency range using a band-pass filter. Changing of filter is not possible ➔ Multiply input with generated frequency to transform signal and calculate back to original value after measurement.

Q:

When is a signal classified as broadband?

A:

>6 dB difference between Average and Peak value

Q:

Explain the definition of EMC

A:

Electromagnetic Compatibility

„The ability of an equipment or system tofunction satisfactorily in its electromagnetic environment without introducing intolerable electromagnetic disturbances to anything in that environment“

Emission (legislation) - Immunity (OEM specification)

Q:

What is the complexity of EMC in a vehicle environment?

A:
• Immunity
• Root cause analysis difficult due to networked system
• Emission
• Device under test must be isolated ➔ Rest bus simulation required
• Optical link between DUT and measurement devices to prevent influences
• New Operating modes in electric or hybrid vehicles that are hard to reproduce (boosting, recuperating, ...)
Q:

How can one shield against electromagnetic coupling effects?

A:

- Cable shielding with mesh wire, metal slide or metal tube (Copper or aluminium)

- Shielding of the housing (Metal)
- Material: Laminations or slides of galvanized steel, aluminium or copper

### Erstelle und finde Lernmaterialien auf StudySmarter.

Greife kostenlos auf tausende geteilte Karteikarten, Zusammenfassungen, Altklausuren und mehr zu.

## Das sind die beliebtesten StudySmarter Kurse für deinen Studiengang EM4: Automotive EMC Technology an der Karlsruher Institut für Technologie

Für deinen Studiengang EM4: Automotive EMC Technology an der Karlsruher Institut für Technologie gibt es bereits viele Kurse, die von deinen Kommilitonen auf StudySmarter erstellt wurden. Karteikarten, Zusammenfassungen, Altklausuren, Übungsaufgaben und mehr warten auf dich!

## Das sind die beliebtesten EM4: Automotive EMC Technology Kurse im gesamten StudySmarter Universum

##### Technology 1

University of Salford